Fast and accurate simulations of transmission-line metamaterials using transmission-matrix method

Recently, two-dimensional (2D) periodically L and C loaded transmission-line (TL) networks have been applied to represent metamaterials. The commercial Agilent's Advanced Design System (ADS) is a commonly-used tool to simulate the TL metamaterials. However, it takes a lot of time to set up the TL network and perform numerical simulations using ADS, making the metamaterial analysis inefficient, especially for large-scale TL networks. In this paper, we propose transmission-matrix method (TMM) to simulate and analyze the TL-network metamaterials efficiently. Compared to the ADS commercial software, TMM provides nearly the same simulation results for the same networks. However, the model-process and simulation time has been greatly reduced. The proposed TMM can serve as an efficient tool to study the TL-network metamaterials.Comment: 15 pages, 13 figure

Illusion Media: Generating Virtual Objects Using Realizable Metamaterials

We propose a class of optical transformation media, illusion media, which render the enclosed object invisible and generate one or more virtual objects as desired. We apply the proposed media to design a microwave device, which transforms an actual object into two virtual objects. Such an illusion device exhibits unusual electromagnetic behavior as verified by full-wave simulations. Different from the published illusion devices which are composed of left-handed materials with simultaneously negative permittivity and permeability, the proposed illusion media have finite and positive permittivity and permeability. Hence the designed device could be realizable using artificial metamaterials.Comment: 9 pages, 4 figures, published in Appl. Phys. Lett

Important influencing factors analysis of airport sustainable development capacity: the case of China

Purpose: This paper seeks to define and build the formation mechanism for airport sustainable development capacity. Design/methodology/approach: Structure Equation and System Dynamic Model are used to research the formation mechanism of airport sustainable development capacity. Findings: The most influencing factors are: airport own investment, Gross Domestic Product and power consumption of unit income. Originality/value: Firstly, a new concept to evaluate the dynamic work on sustainable development is proposed, which is defined as airport sustainable development capacity. Secondly, the formation mechanism of airport sustainable development capacity is studied through Structure Equation Model and System Dynamics model. It fills in the gap of existing research whose main focus is static evaluation of airport sustainable development capacity and influencing factors identification rather than dynamic formation mechanism.Peer Reviewe